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access icon free A low-complexity demodulation technique for spectrally efficient FDM systems using decision-feedback

Spectrally efficient frequency division multiplexing enables higher spectral efficiency at the cost of suffering from inter-carrier interference (ICI), which leads to either a severe error floor or a heavy computational burden at the receiver. In this study, the authors propose a low-complexity demodulation technique, in which the detected symbols are used as feedback to effectively mitigate ICI. To restrain the error propagation caused by non-ideal feedback, the authors enumerate subsequent unknown symbols as preconditions, and then perform the demodulation based on minimum distance criterion, in order to enable the optimal solution in each step of feedback. As a consequence, the computations necessitated to data demodulation can be significantly reduced as a quadratic order of symbol-size. Furthermore, the authors mathematically characterise the demodulation performance by deriving the signal-to-interference-plus-noise ratio as a function of bandwidth compression factor. It is shown that the demodulation scheme can effectively reduce the error floor raised by ICI while preserving a low complexity. Simulation results demonstrate that the proposed demodulator outperforms the conventional ones, and achieves indistinguishable performance as that of orthogonal frequency-division multiplexing while increasing up to 25% spectrum efficiency.

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-com.2017.0069
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content/journals/10.1049/iet-com.2017.0069
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